凝胶注模成型陶瓷坯体脱脂过程的研究  

Debinding of Gelcasting Al_2O_3 Green Body

作　　者：张立明[1,2] 张丽[1,3] 王龙光[1] 周会俊[1] 刘鹏[1] 李志宏[3] 黄勇[2] 

机构地区：[1]中钢集团洛阳耐火材料研究院,河南洛阳471039 [2]清华大学材料科学与工程系,北京100084 [3]天津大学材料学院,先进陶瓷与加工技术教育部重点实验室,天津300072

出　　处：《稀有金属材料与工程》2008年第A01期697-701,共5页Rare Metal Materials and Engineering

基　　金：国家973项目(G2000067204-01);国家自然科学基金重点项目(50232010)资助

摘　　要：通过热分析仪与傅立叶红外变换光谱仪联用,研究了凝胶注模陶瓷坯体的脱脂过程,结果表明:凝胶注模氧化铝坯体脱脂过程中,有机物在210～470℃之间较窄的温度范围内裂解氧化,并呈现出明显的两阶段特征,裂解氧化产生气体的速率高于气体逸出的速率而引起坯体开裂。据此,提出了在保证坯体足够强度的前提下降低有机物含量、并在脱脂过程中分阶段保温等措施,有效抑制了凝胶注模陶瓷坯体在脱脂过程中的开裂现象。The debinding process of gelcasting Al2O3 green body was investigated by TG/DTA and FTIR. Results show that polyacrylamide in the ceramic green bodies decomposed and oxidized at the temperature between 210-470℃ when bodies debinding, which presented two obvious stages. The occurance of cracking was caused by the gas rate of debinding higher than that of escaping. Based on the results above, a systematic approach such as decreasing the organic wntent and keeping certain temperature under the condition of necessary strength of the bodies, was put forward to suppress cradking.

关 键 词：氧化铝 凝胶注模 脱脂 

分 类 号：TQ174.6[化学工程—陶瓷工业]